This is Javascript function that does it

function wiggle(n) {
if (window.moveBy) {
for (i = 10; i > 0; i--) {
for (j = n; j > 0; j--) {
window.moveBy(0,i);
window.moveBy(i,0);
window.moveBy(0,-i);
window.moveBy(-i,0);
}
}
}
}

and than do something like

onMouseover='wiggle(3)'
to invoke it